annotate toolboxes/FullBNT-1.0.7/bnt/inference/dynamic/@cbk_inf_engine/marginal_family.m @ 0:e9a9cd732c1e tip

first hg version after svn
author wolffd
date Tue, 10 Feb 2015 15:05:51 +0000
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wolffd@0 1 function m = marginal_family(engine, i, t)
wolffd@0 2 % MARGINAL_FAMILY Compute the marginal on the specified family (bk)
wolffd@0 3 % marginal = marginal_family(engine, i, t)
wolffd@0 4
wolffd@0 5 % This is just like inf_engine/marginal_family, except when we call
wolffd@0 6 % marginal_nodes, we provide a 4th argument, to tell it's a family.
wolffd@0 7
wolffd@0 8 if nargin < 3, t = 1; end
wolffd@0 9
wolffd@0 10 bnet = bnet_from_engine(engine);
wolffd@0 11 if t==1
wolffd@0 12 m = marginal_nodes(engine, family(bnet.dag, i), t, 1);
wolffd@0 13 else
wolffd@0 14 ss = length(bnet.intra);
wolffd@0 15 fam = family(bnet.dag, i+ss);
wolffd@0 16 if any(fam<=ss)
wolffd@0 17 % i has a parent in the preceeding slice
wolffd@0 18 % Hence the lowest numbered slice containing the family is t-1
wolffd@0 19 m = marginal_nodes(engine, fam, t-1, 1);
wolffd@0 20 else
wolffd@0 21 % The family all fits inside slice t
wolffd@0 22 % Hence shift the indexes back to slice 1
wolffd@0 23 m = marginal_nodes(engine, fam-ss, t, 1);
wolffd@0 24 end
wolffd@0 25 end